RU111230U1 - PULSE-SAFETY DEVICE (IPU) - Google Patents

Abstract

 1. A pulse-safety device containing a main valve, a supra-piston cavity in communication with inlet pipes and inlet and discharge pipes of pulse valves made with a spring-loaded spool, indicator piston and sleeve, a control valve from an external pressure source, a shut-off valve to ensure that the main valve operates without triggering of pulse valves, an additional control line for remote control from the block control panel of the main valve with beyond design basis ii, characterized in that the pulse valve are structured as a single block on a plate having channels which connect the inlets of valves with a protected environment, with the cavity above the piston of the main valve and the valve setting. ! 2. The pulse-safety device according to claim 1, characterized in that a divider in the form of a conical glass with holes is installed in the outlet pipe of the main valve. ! 3. The pulse safety device according to claim 1, characterized in that the plate with pulse valves is attached to the main valve with brackets on one side of the main valve. ! 4. The pulse safety device according to claim 1, characterized in that the pulse valves to increase rigidity are additionally interconnected by a bar.

Description

The proposed utility model relates to the field of pipe fittings, namely, to pulse-safety devices (IPS) used in various technological processes, in particular, in the protection system of nuclear power plants (NPPs).

The purpose of the utility model is to increase the reliability, manufacturability of IPA manufacturing, reduce the impact of water hammer when relieving excess pressure of the medium.

The subject of consideration is an ISP designed to protect the primary circuit of nuclear power plants with VVER-type reactors by automatically depressurizing the working medium pressure from the pressure compensator into the bubbler in case of violation of normal operating conditions, during design basis accidents and the implementation of the feed and bleed procedure in the conditions of beyond design basis accidents.

The known design of the IPU (prototype), a patent for utility model RU 54130 U1, F16K 17/02, published on 10.06.2006. An IPU consists of a unit assembled in a block: a main valve (GK) with a piston actuator, two pulse valves (IR), the inlet pipes of which are connected separately by pipes and fittings with a protected system and mounted on brackets on opposite sides of the GK, a tuning valve (KN) , shut-off valve (OK), auxiliary control line (DLU). The main group contains: a housing, a spool, a spring, an inlet pipe, an outlet pipe and a pipe for discharging the working medium from the over-piston cavity, a spool position sensor. The IR contains a spool, an indicator piston, a sleeve, a spring, a rod, an inlet pipe, a discharge pipe, and a supply pipe (discharge) of the working medium from the IR to the over-piston cavity of the main gun. IR is equipped with an electromagnet and a position sensor of the locking element. The IRs are structurally symmetrically arranged to the main assembly and are connected to the last brackets, and the inlet branch pipes of the infrared assembly are separately connected to the inlet of the main assembly and the pipes and fittings protected by the system. DLU consists of a shut-off valve with an electromagnetic actuator (KZEM) and a shut-off valve with an electric actuator (KZEP) connected to the supra-piston cavity of the main gun; a position sensor is installed on the electromagnet KZEM. IPU provides automatic discharge of excess pressure of the working medium from the pressure compensator of the primary circuit of the reactor plant of the NPP into a bubbler.

The disadvantages of the well-known ISPs are: 1. separate connection of the IR inlet nozzles with the protected system using pipes, which reduces the reliability of the IPU design, 2. separate fastening of each IR to the main gun using brackets, which reduces the rigidity and manufacturability, 3. lack of protection against water hammer during the discharge of excess pressure from the outlet of the Civil Code.

The stated technical problem is achieved by the fact that the pulse valves are structurally made as a single block on a plate having channels connecting the valve inlet channels with the medium to be protected, with a supra-piston cavity of the main valve and a tuning valve; to reduce the effect of water hammer in the outlet of the main valve, a divider is installed in the form of a conical glass with holes; a plate with pulse valves is attached to the main valve with brackets on one side of the main valve; impulse valves for additional rigidity are additionally interconnected by a strap

The positive effect of IPA is illustrated by drawings, which depict:

Figure 1 is a circuit diagram of the IPA.

Figure 2 - General view of the block of pulse valves

Figure 3 - connection diagram of the channels in the plate with IR, GK and KN

Figure 4 - General layout IPU

The IPA consists (Figs. 1, 4) of the main valve 1 (CC), connected to the block (Fig. 2) of two pulse valves 2 (PC), the shut-off valve 3 (OK), the control valve 4 (KN), an additional control line 5 (DLU).

GK 1 contains a spool 6, a spring 7, an inlet pipe 8, an outlet pipe 9 with a divider 10, and a pipe 11 for discharging (supplying) a working medium from the over-piston cavity "A" connected to inlet pipes PC 2, a position sensor 12 (DP GC) of the spool made using contacts and a lever (conventionally not shown).

IK 2 contains a spool 13, a spring 14, a rod 15, an indicator piston 16, a sleeve 17, an inlet pipe 18, a pipe 19 for discharging (supplying) a working medium from IK 2 to the over-piston cavity “A” of the Civil Code 1, electromagnet 20 (EM IR) and position sensor 21 (DP IR) spool. The electromagnet 20 is connected to the spool 13 and serves to trigger the GC 1 from the control panel. Both IR 2 are connected in a single unit (figure 2, 3, 4) on the plate 22 having an inlet pipe 23 (figure 4), connected to the valve settings 4 (KN) from an external pressure source, pipe 24 (figure 3) connected to the above-piston cavity “A” of the Civil Code 1. Plate 22 (FIG. 2) with brackets 26, 27 and fasteners is connected to the Civil Code 1. IR 2 is additionally connected to each other by the bracket 27 and the strap 28.

The shutoff valve 3 (OK) has an electromagnet 29 (EM OK) and a position sensor 30 (DP OK). In the case of non-closure of IK 2 when the ISP is triggered, the inclusion of OK 3 provides for compulsory closure of GK 1, cutting off the supra-piston cavity “A” of GC 1 from IK 2.

DLU 5 includes an electromagnetic shut-off valve 31 (KZEM), a shut-off valve with an electric actuator 32 (KZEP) and is designed for remote control from the control panel GK 1 during a beyond design basis accident and mitigate its consequences by forcing the opening of GK 1 and reducing the pressure in the system.

The adjustment valve KN 4 provides the setting of IR 2 and the actuation of the ISP from an external source at a system pressure of more than 0.7 PP

Work IPA.

The medium with a working pressure Рр is supplied from the protected system (pressure compensator) to the inlet pipe 8 ГК 1, to the pipe 23 ИК 2 through the channels in the plate 22. Through the throttle openings of the spool 6 ГК 1 and the throttle between the indicator piston 16 and the sleeve 17 IK 2, the medium enters in the above-piston cavity "A", providing the necessary seal force in the valve GK 1. The initial seal force is achieved due to the installation force of the spring 7.

In the normal operating conditions of the reactor installation of the NPP NPP, it is in standby mode, in which:

- GK 1 is closed by the pressure of the medium

- OK 3 open, OK electromagnet de-energized

- both IR 2 are closed, a holding current flows in the EM 20 winding, providing additional force to press the spool to the seat

- KH 4 is closed

- valves DLU 5 KZEM 31 and KZEP 32 are closed

With the normal operation of the ISP when the GC 1 is triggered from IK 2, the KZEM and KZEP operation settings are in the closed state.

The design ensures that the ISP is triggered by EM 20 IK 2 at a pressure of at least 0.8 Rp and IK 2 is kept open to a pressure of 0.65 Pp. With increasing pressure in the system until the opening pressure is set to IR 2, the EM 20 closing winding is disconnected from the pressure sensor by the IPU control system and the EM 20 opening winding is turned on, IR 2 is opened, discharges the medium from the over-piston cavity “A” GK 1, the spool 6 GK 1 moves up , GK 1 opens and relieves excess pressure in the system and closing pressure. When the pressure decreases to set the closing pressure OK 3 (if the IK 2 is not closed), the control system turns on the EM 29 of the OK 3 closure. The OK 3 valve disconnects the IK 2 from the supra-piston cavity ГК 1 and the medium pressure in the supra-piston cavity “A” and the spring force 7 GK 1 closes.

To improve the reliability of the operation of the pulse valves IR 2 and the manufacturability by eliminating the separate connection of IR 2 by pipe connections in the proposed design, both IR 2 are mounted in a single block on a plate 22 having channels for connecting the input channels of IR 2, the over-piston cavity of the main valve “A” with a protected environment, as well as with a setting valve 4. Plate 22 with IR 2 is attached to the Civil Code 1 by brackets 26, 27 and fasteners. Additionally, IR 2 are interconnected by a strap 28 and fasteners.

To reduce the impact of water hammer when overpressure is released, the discharge pipe GK 1 has a divider 10 in the form of a conical glass with holes.

The list of positions and accepted abbreviations in figures 1, 2, 3, 4

1 - main valve (GK)

2 - pulse valve (IR)

3 - shut off valve (OK)

4 - tuning valve (KN)

5 - additional control line (DLU)

6 - spool

7 - spring

8 - inlet pipe GK

9 - output pipe GK

10 - divider

11 - pipe discharge (supply) of the working medium from the supra-piston cavity GK

12 - position sensor GK (DP GK)

13 - spool

14 - spring

15 - stock

16 - indicator piston

17 - sleeve

18 - inlet pipe

19 - pipe discharge (supply) of the working medium from the PC to the over-piston cavity

20 - IR electromagnet (EM IR)

21 - position sensor spool IR

22 - stove

23 - inlet pipe

24 - pipe connection IR with the above-piston cavity "A"

25 - pipe connection IR with the above-piston cavity "A"

26 - bracket

27 - bracket

28 - strap

29 - solenoid shut off valve (EM OK)

30 - datapod of shutdown valve shutdown (DP OK)

31 - electromagnetic shut-off valve (KZEM)

32 - shut-off valve with electric actuator (KZEP)

"A" - episton cavity of the Civil Code

Claims (4)

1. A pulse-safety device containing a main valve, a supra-piston cavity in communication with inlet pipes and inlet and discharge pipes of pulse valves made with a spring-loaded spool, indicator piston and sleeve, a control valve from an external pressure source, a shut-off valve to ensure that the main valve operates without triggering of pulse valves, an additional control line for remote control from the block control panel of the main valve with beyond design basis ii, characterized in that the pulse valve are structured as a single block on a plate having channels which connect the inlets of valves with a protected environment, with the cavity above the piston of the main valve and the valve setting. 2. The pulse-safety device according to claim 1, characterized in that a divider in the form of a conical glass with holes is installed in the outlet pipe of the main valve. 3. The pulse safety device according to claim 1, characterized in that the plate with pulse valves is attached to the main valve by brackets on one side of the main valve. 4. The pulse safety device according to claim 1, characterized in that the pulse valves to increase rigidity are additionally interconnected by a bar.